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Work Power & Energy MCQ Test

Quiz
Work  Power & Energy

Quiz-Work & Energy



1. When a stone tied to a string is whirled in a circle, what kind of work is said to be done on it by the string?

Positive

Negative

Zero

None


2. The work done by the weight of 1 kg mass while it moves up through 1 m is

-9.8J

9.8J

1/9.8J

-1/9.8J


3. A force of 10N act on a body towards East. The work done by the force while the body moves 1 m in east north direction.

10√2 J

10/√2 J

-10 J

-10/√2 J


4. A man with box on his head is climbing up in ladder. The work done by the man on the box is

Positive

Negative

Zero

None


5. A porter with a suitcase on his head is climbing up on stair with uniform speed the work done by ‘weight of suitcase’ on the suitcase.

Positive

Negative

Zero

None


6. As a body roll down on inclined plane, it has

Only K.E

Only P.E

Both K.E & P.E

None


7. In which of the following cases is the potential energy of a spring minimum?

When it is compressed

When it is extended

When it is at its natural length

When it is at its natural length but is kept at a height h above the ground


8. A ball is thrown upwards from a point A. It reaches up to the highest point B and returns.

Kinetic energy at A = Kinetic energy at B

Potential energy at A = Potential energy at B

Potential energy at B = Kinetic energy at B

Potential energy at B = Kinetic energy at A


9. A body of mass 2 kg is dropped from a height of 1 m. Its kinetic energy as it reaches the ground is

19.6 J

19.6 N

19.6 kg

19.6 m


10. Two bodies of unequal masses are dropped from a cliff. At any instant, they have equal

Momentum

Acceleration

Kinetic energy

Potential energy




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